noun
plural buffs
[count] :a person who is very interested in something and who knows a lot about it
noun
[noncount] :a light somewhat yellow or orange color - see color picture - compare 1buff
in the buff
informal :not wearing any clothes :naked
to the buff
informal :to a naked condition
adjective
or buffed
[more ~; most ~] US informal :having a strong, muscular body or form
verb
buffs; buffed; buffing
[+ obj] :to make (a surface) smooth and shiny by rubbing it
buff up
[phrasal verb]
buff up or buff (someone or something) up or buff up (someone or something) informal :to become stronger and more muscular or to make (someone or something) stronger and more muscular by exercising and weight lifting